Artículos de revistas
Uranium-bearing francolites present in organic-rich limestones of NW Greece: a preliminary study using synchrotron radiation and fission track techniques
Fecha
2017-01-01Registro en:
Journal Of Radioanalytical And Nuclear Chemistry. Dordrecht: Springer, v. 311, n. 1, p. 465-472, 2017.
0236-5731
10.1007/s10967-016-4973-4
WOS:000392075200049
WOS000392075200049.pdf
Autor
Aristotle Univ Thessaloniki
Heidelberg Univ
Univ Athens
Karlsruhe Inst Technol
Tech Univ Denmark
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Synchrotron radiation techniques (mu-XRF and mu-XANES) were applied to the study of organic-rich phosphatized limestones of NW Greece (Epirus). The results revealed uranium accumulation in areas of the material containing, among others, carbonate apatite (francolite) and organic matter. The UL (3)-edge of mu-XANES spectra showed that uranium was present in tetravalent form. U-bearing francolite crystals were separated from the rock and characterized by Raman spectroscopy and microprobe. The analysis of the crystals also indicated the presence of sodium and sulfur. The uranium presence in the crystals was also visualized, after neutron irradiation and etching, by the observation of the fission tracks.